KR102441906B1 - Manhole fixing frame open/close signal recognition control device - Google Patents

Abstract

Provided is a technology of an instrumentation control apparatus including a function for recognizing opening and closing of a manhole cover which reduces inconvenience of work caused by a preexisting manhole cover opening and closing sensing technology, reduces failure due to external impact, and significantly improves maintenance properties. A manhole fixing frame opening and closing signal recognition control apparatus according to one embodiment of the present invention comprises: a plurality of coil sensors installed on a side of a manhole housing on which a manhole cover is mounted; a signal line transmitting sensing values of the coil sensors; and an opening and closing detection unit receiving the sensing value of the coil sensor through the signal line and detecting whether the manhole cover is opened or closed based on the received sensing value.

Description

Manhole fixing frame open/close signal recognition control device

The present invention relates to an instrumentation control device having a function of detecting opening and closing of a manhole that is formed in a facility such as a sewer and is installed to block and open a sewer access road and the ground. Specifically, the existing manhole cover opening/closing sensing It relates to a technology of an instrumentation control device including a recognition function of opening and closing a manhole cover, which is less cumbersome of work by technology, has fewer failures due to external impact, and has greatly improved maintainability.

A number of manholes are installed on the ground such as roads and sidewalks. The manhole, in particular, is essentially installed in order to connect or block the sewer and the ground, so that a worker can enter and perform maintenance on facilities such as a valve and a pump inside the sewer.

In this case, it is very essential to remotely sense whether the manhole is opened or closed. This is because, for example, if the manhole is normally open, it is a great threat to the safety of vehicles or pedestrians, and conversely, if the manhole is accidentally closed while the worker enters the sewer, it is a great threat to the safety of the worker. .

In order to solve this problem, a technology for remotely sensing whether the manhole is opened or closed is being implemented. For example, in Korea Patent Registration No. 10-2090534, etc., a door sensor that detects the situation inside the manhole integrated on the lower surface of the manhole cover is installed, and through this, it detects whether the manhole cover is opened or closed and notifies the remote server. technology is presented.

However, the existing technology of installing the sensor on the lower surface integrally with the manhole cover has a big problem. That is, according to the existing technology, the sensor is installed on the lower surface of the manhole cover, for example, when the water level rises to the manhole cover, there is a problem that the sensor, which is an electric device, may malfunction due to contact with water. connect.

In addition, since the sensor is installed protruding from the bottom of the manhole cover, it is very difficult for the operator to manage the manhole cover, which causes great hassle in the operation. In addition, when an external shock is frequent, such as a vehicle passing by, the sensor is broken by the shock applied to the cover, or the sensor is installed in the manhole cover separated from the ground, so power cannot be stably supplied. Problems inevitably arise.

Accordingly, the present invention has been derived to solve the problems of the existing technologies as described above, and proposes a new technology to detect the opening and closing of the manhole cover in a completely independent space in the housing area where the cover is mounted, not the manhole cover, It can solve the hassle of work due to being able to use the manhole cover as it is, and it prevents the sensor from malfunctioning even when the impact is applied to the cover, and at the same time, it can supply power stably, so that the maintenance can be greatly improved. An object of the present invention is to provide a technology of an instrumentation control device including a function of recognizing the opening and closing of a manhole cover.

In order to achieve the above object, the manhole fixing frame open/close signal recognition control device according to an embodiment of the present invention, a plurality of coil sensors installed on the side of the manhole housing is mounted the manhole cover; a signal line for transmitting the sensed value of the coil sensor; and an opening/closing detection unit that receives the sensing value of the coil sensor through the signal line, and detects whether the manhole cover is opened or closed based on the received sensing value.

The coil sensor may include a plurality of coils installed in a height direction of the manhole housing; a power applying unit for applying power to the coil; and a meter for measuring the output voltage when the manhole cover is mounted on the manhole housing or removed.

The instrument may include a phase detector and an amplifier for null voltage rejection depending on the geometry of the housing and the cast iron material.

The measuring instrument may include a proportional signal converter for noise cancellation.

The opening/closing detection unit may detect whether the manhole cover is opened or closed according to the output voltage measured from the measuring instrument.

The coil may be installed on the outer surface of the manhole housing.

The coil, it is possible to be installed through an adhesive member on the inner surface of the manhole housing.

The coil sensor further includes a housing cover detachably installed on the upper portion of the manhole housing, wherein the coil is configured to be installed on the housing cover, and as the housing cover is installed on the manhole housing, the It is possible that the coil is configured to be installed on the side of the manhole housing.

The coil sensor may be a coil sensor based on the principle of a linear variable displacement transducer (LVDT).

It is possible to further include; according to the detection value of the opening/closing detection unit, an information transmission unit for outputting notification information on whether the manhole cover is opened or closed or for transmitting to the manager terminal.

According to the present invention, when supplying power using wired power to a number of coil sensors on the manhole housing installed on the ground so that the manhole cover is mounted so that the manhole cover, not the manhole cover, is stably fixed and installed on the ground , by using the difference in the voltage value sensed as the manhole cover is mounted or removed, it is possible to precisely detect the opening and closing of the manhole cover even if there is no sensing facility in the manhole cover.

Accordingly, since the opening and closing of the manhole cover can be sensed in a space completely independent of the housing area where the cover is mounted, rather than the manhole cover, there is an effect that can solve the hassle of work due to being able to use the manhole cover as it is.

In addition, since no equipment is installed on the lid even by the impact applied to the lid, the failure of the sensor can be prevented. There is an effect that the maintenance can be greatly improved by making it possible to supply stably to the line.

1 is a view for explaining the configuration of a manhole fixing frame opening and closing signal recognition control apparatus according to an embodiment of the present invention.
Figure 2 is a side cross-sectional view for explaining the structure of the coil sensor according to an embodiment of the present invention.
3 is an implementation circuit diagram of a coil sensor according to an embodiment of the present invention.
4 is an implementation circuit diagram of an instrument according to another embodiment of the present invention;
5 and 6 are side cross-sectional views for explaining the installation structure of the coil sensor according to another embodiment of the present invention.

Hereinafter, various embodiments and/or aspects are disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will also be recognized by one of ordinary skill in the art that such aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain illustrative aspects of one or more aspects. These aspects are illustrative, however, and some of the various methods in principles of various aspects may be employed, and the descriptions set forth are intended to include all such aspects and their equivalents.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. may not be construed as an advantage or advantage in any aspect or design described above over other aspects or designs. .

Also, the terms "comprises" and/or "comprising" mean that the feature and/or element is present, but excludes the presence or addition of one or more other features, elements and/or groups thereof. should be understood as not

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are those commonly understood by those of ordinary skill in the art to which the present invention belongs. have the same meaning. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

1 is a view for explaining the configuration of a manhole fixing frame opening/closing signal recognition control device according to an embodiment of the present invention, FIG. 2 is a side cross-sectional view for explaining the structure of a coil sensor according to an embodiment of the present invention, FIG. 3 is an implementation circuit diagram of a coil sensor according to an embodiment of the present invention, Figure 4 is an implementation circuit diagram of a measuring instrument according to another embodiment of the present invention, Figures 5 and 6 are the installation structure of the coil sensor according to another embodiment of the present invention It is a side cross-sectional view for explanation. In the following description, the details described in the drawings are omitted, or excessively enlarged or reduced, in order to explain the function of each configuration of the present invention, but the illustrated matters are the technical features and scope of the present invention It will be understood that it is not intended to limit the

In addition, in the following description, a plurality of drawings will be simultaneously referenced and described in order to explain one technical feature or component constituting the invention.

Referring to the above drawings together, the manhole fixing frame opening/closing signal recognition control device (hereinafter referred to as 'the device of the present invention') according to an embodiment of the present invention, the coil sensor 10, the signal line 20 and the opening/closing detection It is characterized in that it comprises a part (30).

The instrumentation control device 100 of the present invention processes and analyzes external data, such as flow rate, pressure, temperature, humidity, etc. measured from various instruments by the central processing unit and internal and external programs, and controls the connected external devices and controls the central system. As an automated facility that operates and manages the entire system through a configuration including a measurement and control facility, in the present invention, the opening/closing detection unit 30 and a part of the signal line 20 may be included in the instrumentation control device 100, The device of the present invention may be understood as a device corresponding to one configuration included in the instrumentation control device, including the above-described coil sensor 10 , the signal line 20 , and the open/close detection unit 30 .

The coil sensor 10 is configured to include a plurality of sensors installed on the side of the manhole housing 210 on which the manhole cover 200 is mounted. As shown in FIG. 1, the core technical feature of the present invention is that the configuration of the coil sensor 10 installed to detect whether the manhole cover 200 is opened or closed is not the manhole cover 200, but the manhole housing 210 ) to be installed on the side of the Basically, the manhole housing 210 is installed buried in the ground, and the manhole cover 200 is mounted on or separated from the manhole housing 210 for opening and blocking the sewage.

According to the configuration of the coil sensor 10 as described above, since the sensor is installed in the buried manhole housing 210, there is no possibility of separation from the power line or the signal line 20, and there is no need for a battery, so stable power supply and Signal transmission and reception is possible.

Specifically, in the present invention, the coil sensor 10 is preferably configured as a coil sensor using the principle of a linear variable displacement transducer (LVDT).

Linear variable displacement transducers, LVDTs are electromechanical equipment that converts mechanical motion or vibration, particularly linear motion, into a variable current, voltage or electrical signal and vice versa. The actuating mechanism is mainly used for automatic control devices or as mechanical motion sensors in measuring technology. Electromechanical transducers are classified according to the conversion principle or type of output signal.

A typical LVDT has three cylindrical coils that are connected end-to-end and surround the tube. It consists of a central primary coil and two secondary coils located above and below. When an object for position measurement is attached to a cylindrical ferromatic core and descends along the axis of the tube. An alternating current moves the primary coil and induces a voltage proportional to the length of the connected core to the two secondary coils. The frequency range is usually 1 to 10 kHz.

The movement of the core triggers a connection from the primary coil to the two secondary coils, which changes the induced voltage. The upper and lower secondary output voltage differential is the movement from the corrected zero phase. Synchronous detectors allow reading of the signaled output voltage related to the displacement.

With LVDT repeatable and reproducible absolute position sensors, linear displacements can be up to several inches long. Other actions and movements do not affect the measurement accuracy. LVDTs are also highly reliable as the descending core does not come into contact with the interior of the tube and allows the LVDT to be in a completely enclosed environment.

In order to use this principle, in an embodiment of the present invention, the coil sensor 10 includes a plurality of coils 11 , a power supply unit and a measuring instrument 12 .

Basically, as shown in FIG. 1, the power applying unit and the measuring instrument 12 are shown to be separated from the instrumentation control device 100, but depending on the installation type, the hardware including the power applying unit and the measuring instrument 12 is instrumented. It is preferable to be implemented to be installed inside the housing of the control device 100 and to be electrically connected to the coil 11 by the signal line 20 .

The coil 11 means a plurality of coils installed in the height direction of the manhole housing 210 as shown in FIG. 2 according to the principle of the LVDT sensor described above. At this time, for example, it would be preferable to install the manhole housing 210 on the outer surface as shown in FIG. 2 in order to prevent impact and damage caused by the external force of the coils 11 .

On the other hand, the plurality of coils 11 are preferably installed in the height direction of the manhole housing 210, which is moved in order to detect a linear movement of a specific object in one direction in the principle of the LVDT sensor as described above. According to the principle in which the first, second, and tertiary coils are arranged according to the direction, the manhole cover 200 is moved in the height direction relative to the manhole housing 210 .

2 and 3 , specifically, the coil 110 is configured to include a primary coil 112 , a secondary coil 111 , and a tertiary coil 113 . Although the identification information of each coil (111, 112, 113) is set in the order of its installation height, it can be seen that the above-mentioned coil naming is referred to according to the principle of the above-described LVDT sensor. In order to enable precise measurement, the insulation resistance between lines is preferably set to be 1 megaohm or more.

The power supply unit, for example, applies power to the primary coil 112, and the core generated as the manhole cover 220 as the core above, and the core generated as the manhole housing as the core below the relative movement occurs. Accordingly, the induced voltages e1 and e2 are changed for the two coils of the secondary coil 111 and the tertiary coil 113 . At this time, if the output voltage (eout) is used, the relative position change of the sphere core can be grasped, and accordingly, it is possible to determine whether the manhole cover 200 is mounted on the manhole housing 210 or is in a separated state. will be.

This function of measuring the output voltage (eout) is performed by the measuring instrument, that is, the measuring instrument is the output voltage (eout) that is changed according to the above-described principle when the manhole cover 200 is mounted on or separated from the manhole housing 210 . function to measure

The opening/closing detection unit 30 receives the output voltage sensed by the measuring instrument, that is, the sensing value of the coil sensor 10, and detects whether the manhole cover 200 is opened or closed based on this. Specifically, the opening/closing detection unit 30 is a preset value or an output voltage measured at the time of initial installation, and a discontinuous value for the output voltage eout according to the relative position of the manhole cover 200 with respect to the manhole housing 210 Alternatively, by using a continuous relational function, a signal for whether or not the actual manhole cover 200 is opened or closed or a positional state is generated.

Although the illustration is omitted in FIG. 1 , the sensing value generated by the opening/closing sensing unit 30 is transmitted to the outside by an information transmitting unit (not shown). Specifically, the information transmitting unit outputs notification information on whether the manhole cover 200 is opened or closed according to the detection value of the open/close detection unit to the display unit 50 installed on the outer surface of the instrumentation control device 100 or a remote manager terminal 40 ) to send the function.

Meanwhile, the above-described output voltage eout may be measured with a very minute difference. In this case, the initial voltage generated by the plurality of winding coils becomes a null voltage instead of 0V depending on the applied power. Since this null voltage makes precise measurement impossible when the change amount of the voltage, that is, the voltage fluctuating according to the opening and closing of the manhole cover 200 is small, it is necessary to remove it in the present invention.

That is, since the voltage difference when the lid is opened and the change in the minimum voltage when the lid is closed are smaller than the null voltage, the null voltage must be removed to detect the sensitive change. In general, the method of making the voltage Vout occurring in the secondary winding to zero is that the two physical quantities (VA = Asin(wt+Φa), Vb = Bsin(wt+Φb)) of the primary side and the secondary side of a differential transformer in AC should be the same. At this time, two conditions of A = B and Φa = Φb must be satisfied.

However, although the manhole housing 210 made of cast iron was used as a bobbin, the geometry of the manhole housing 210 is not a simple bobbin shape due to the support, and the cast iron does not have high specific resistance, so the two secondary windings 111 and 113 ) and the leakage inductance. Therefore, the equivalence condition of the above two physical quantities (A = B, Φa = Φb) cannot be satisfied, and in particular, since it is difficult to match the phases, a NULL voltage is generated.

In order to make the voltage generated in the secondary windings 111 and 113 to 0 as described above, in another embodiment of the present invention, the measuring instrument is a null voltage according to the geometry of the housing and the cast iron material as shown in FIG. 4 . It is desirable to include a phase detector and an amplifier for cancellation.

The circuit diagram of FIG. 4 shows the power applying unit and the measuring instrument 12 described above, and in this case, the power applying unit 121 and the measuring instruments 122 and 123 may be included as detailed configurations. At this time, it is composed of a phase detector 122, a proportional signal converter, and an amplifier 123, which will be described later.

According to the phase detector 122 and the amplifier, since the AC signal is converted to an absolute value and then amplified, the voltage generated in the secondary windings 111 and 113 can be made 0, and only the output voltage can be accurately amplified and calculated. there will be

On the other hand, since the signal change rate according to the opening and closing is small in the opening/closing signal, a DC drift acting as a noise is generated as it is greatly affected by disturbances (temperature, etc.). In order to minimize such a DC drift, the measuring instrument of the present invention may be implemented such that a proportional signal converter for noise removal is included in the detailed configuration of the measuring instrument 123 described above.

Ratio-type signal converter is a ratio-type amp. It is stable to changes in various variables, is stable in output, frequency, and temperature of the generator, and the factor a that affects the signal as noise is (a(A-B)/ Since it is reduced according to the expression of a(A+B)), there is an advantage that there is no change in the output.

As described above, according to the detailed configuration of the above-described measuring instruments 122 and 123 , the null voltage is removed and at the same time not affected by external noise, the difference in output voltage according to the relative positions of the manhole cover 200 and the manhole housing 210 . to detect whether the manhole cover 200 is opened or closed by using .

On the other hand, when the coil sensor 10 is directly installed on the outer surface of the manhole housing 210 as shown in FIG. 2 , construction is easy when the initial manhole housing 210 is installed, but the previously installed manhole housing 210 ), there is a problem of complicated construction.

In order to cope with this problem, in the present invention, the coil 11 is installed in various areas of the manhole housing 210 except for the manhole cover 200, and in order to use the principle of the above-described LVDT sensor as it is, FIGS. 5 and 6 An embodiment of the installation as shown in can be implemented.

For example, as in the embodiment of FIG. 5 , the coil 11 is installed on the inner surface of the manhole housing 210 through the adhesive member 13 , and may be implemented so that the exterior is coated with a waterproof coating. Through this, even in the existing installed manhole structure, the sensor can be implemented through simple construction in which the operator opens the manhole cover 200 and then attaches the coil 11 to the inner surface.

In another embodiment, it may be implemented as in the embodiment of FIG. 6 . At this time, the coil sensor 10 may further include a housing cover 14 that is detachably installed on the upper portion of the manhole housing. The housing cover 14 is a disk-shaped member, and means an angle-shaped member that can be fitted while accommodating the upper portion of the manhole housing 210 .

At this time, the coil 11 is configured in a state already installed on the side of the housing cover 14, adjacent to the outer surface of the manhole housing 210 as shown in FIG. 6, which is most similar to the position of FIG. 2, so that the operator When the housing cover 14 is inserted into the manhole housing 210 and installed, the coil 11 may be configured to be disposed such that it is installed on the side of the manhole housing 210 .

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, those skilled in the art will understand that various modifications and variations are possible from the above description. Terms such as "include", "comprise" or "have" described above mean that a component without a particularly opposing description may be embedded, so other components are not excluded. It should be construed as being able to include more. In addition, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (10)

A plurality of coil sensors installed on the outer surface of the manhole housing is mounted on the manhole cover is embedded in the ground;
a signal line for transmitting the sensed value of the coil sensor; and
Includes; an open/close detection unit that receives the sensing value of the coil sensor through the signal line, and detects whether the manhole cover is opened or closed based on the received sensing value;
The coil sensor is
a plurality of coils installed in the height direction of the manhole housing;
a power applying unit for applying power to the coil; and
Including; and a measuring instrument for measuring the output voltage when the manhole cover is mounted on the manhole housing or removed
The coil sensor is not exposed to the inside of the manhole and is configured not to be installed on the manhole cover, so that it is configured not to be affected by the impact applied to the manhole cover and humidity inside the manhole. Device.
delete According to claim 1,
The meter is
Manhole fixing frame opening/closing signal recognition control device, characterized in that it comprises a phase detector and an amplifier for removing null voltage according to the geometry of the housing and the cast iron material.
According to claim 1,
The meter is
Manhole fixing frame opening/closing signal recognition control device, characterized in that it includes a proportional signal converter for noise removal.
According to claim 1,
The opening/closing detection unit,
Manhole fixing frame opening/closing signal recognition control device, characterized in that detecting whether the manhole cover is opened or closed according to the output voltage measured from the measuring instrument.
delete delete According to claim 1,
The coil sensor is
Further comprising; a housing cover that is detachably installed on the upper portion of the manhole housing,
The coil is
It is configured to be installed on the housing cover, and as the housing cover is installed on the manhole housing, the coil is configured to be installed on the side of the manhole housing.
According to claim 1,
The coil sensor is
Manhole fixing frame opening/closing signal recognition control device, characterized in that it is a coil sensor based on the principle of a linear variable displacement transducer (LVDT, Linear Variable Displacement Transducer).
According to claim 1,
Manhole fixing frame opening/closing signal recognition control device, characterized in that it further comprises; according to the detection value of the opening/closing detection unit, outputting notification information on whether the manhole cover is opened or closed or sending it to the manager terminal.

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